[DOCS] Update SECURITY.md

Releases: main
Resolves: #100747
Change-Id: Ifd39f0813996674620fe1b89aef29ca87351e5b9
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78839


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>